id - Denoting which responses belong to the same respondent. Original BESIP identification. Ranges from 7 to 57533. No missing values.

cohort - Birth year of the respondent. Derived from the ageW8 variable of the original dataset. Ranges from 1926-1998. No missing values.

monarchwave - Whether the response came from Wave 8 (=8) or Wave 25 (=25) of BESIP. No missing values.

monarchism - Agreement with continuing the monarchy. Derived from monarchW8 and MonarchW25 of the original dataset. The original item ranged from 1=Strongly Disagree to 5=Strongly Agree, with 9999 denoting missing values. Respondents with missing values on this were eliminated, and the scale was recoded from 0 (Strongly Disagree) to 1 (Strongly Agree).